syzbot

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BUG: KCSAN: data-race in addr_handler / ucma_query

write to 0xffff88812ddf7820 of 28 bytes by task 7338 on cpu 1:
 addr_handler+0x10d/0x2f0 drivers/infiniband/core/cma.c:3523
 process_one_req+0x1f5/0x2e0 drivers/infiniband/core/addr.c:622
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0x4cd/0x9d0 kernel/workqueue.c:3340
 worker_thread+0x581/0x770 kernel/workqueue.c:3421
 kthread+0x488/0x510 kernel/kthread.c:463
 ret_from_fork+0x148/0x280 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

read to 0xffff88812ddf7820 of 28 bytes by task 13116 on cpu 0:
 ucma_query_addr drivers/infiniband/core/ucma.c:925 [inline]
 ucma_query+0x773/0xe70 drivers/infiniband/core/ucma.c:1081
 ucma_write+0x1c9/0x260 drivers/infiniband/core/ucma.c:1856
 do_loop_readv_writev fs/read_write.c:850 [inline]
 vfs_writev+0x42b/0x900 fs/read_write.c:1059
 do_writev+0xe9/0x210 fs/read_write.c:1103
 __do_sys_writev fs/read_write.c:1171 [inline]
 __se_sys_writev fs/read_write.c:1168 [inline]
 __x64_sys_writev+0x45/0x50 fs/read_write.c:1168
 x64_sys_call+0x1ba5/0x3000 arch/x86/include/generated/asm/syscalls_64.h:21
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 13116 Comm: syz.0.2525 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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